Pump.



J. M. STRATTON.

' PUMP. APPLICATION FILED AUG. 26. 1909.

951,663 Patented Mar.8,1910.

JAMES M. STRA'ITON, OF SALEM, OHIO, ASSIGNOR TO THE IDEMING COMPANY, OFSALEM, OHIO, A CORPORATION OF OHIO.

PUMP.

naines..

Specification of Letters Patent.

Patented Mar.. a, 1910.

Application filed August 26, 1909. Serial No. 514,745.

My invention relates to pumps, or, more particularly stated, to doubleacting force pumps in conjunction with an air pumping appliance forcompressed air systems of water distribution. These systems, as is wellunderstood, employ an air-tight tank as the source of supply to variousoutlets and connections throughout a building or a number of buildings,hydrants or plugs, the contents of said tank being subjected to pressurefor the purposel of elevating same to `points above the level of thetank when desired. This pressure must not only be supplied initially butmust be maintained, and to this end the present invention combines witha double acting force pump an air pump partially contained within thepiston-rod ofthe water pump, and suitable connections whereby water maybe aerated and in such condition delivered into the supply tank forfuture use.

The invention will be hereinafter particularly described and pointed outby the claims following.

In the accompanying drawings which form part of this application andwhereon corresponding reference numerals indicate the same partswherever they occur in all gures: Figure 1 represents a longitudinalcentral section through my invention, the pump base and superposed airchamber, the latter appearing in side elevation, Fig. 2 is a relativelyenlarged fragmentary view, also in longitudinal vertical centralsection, of the air pumping valves, and F ig. 3 is a transverse verticalsection on the line le-3,

Fig. 1, looking in the direction indicated by` numerals thereon, lindicates a 'cast base,

and Q-an air chamber common to double actin-g pumps. The body 3 of pumpis bored out horizontally and suitably lined as at 4 to serve as apumping" cylinder, it is also provided with a side extension 4@comprising two tubular compartments or valve cases 4b, the latterrespectively communicating at opposite ends with cylinder 4 by way oflaterally extending ports 4, 4c opening directly into said valvecasesand cylinder. `Within each of said valve cases 4h are locatedalternating pump valves 4d arranged in pairs and adapted to reciprocatefvertically as shown by Fig. 3, such as are common to pump structuresgenerally. Bolted beneath said side extension 4ai is a hollow funnelshaped casting 4e underlying both of said valve cases 4b and terminatingin a downwardly projecting inlet port 5. In like manner, said valvecases 4b are both covered above by a single hollow casting 5a in opencommunication with the interior of the snrmounting air chamber v2aforesaid; while from said air chamber is projected, as indicated at 6,Fig. 1, by dotted lines, the outlet or pump discharge.

As usual in pumps of this type, the interior of pumping cylinder 4communicates with both the inlet 5 and the air chamber 2, havingdischarge outlet 6, by way of the valves and ports aforesaid, theends ofsaid cylinder being closed as usual by removable front and back cylinderheads 7 and 8 respectively. The said head 7 is provided with a properlypacked stuffing boi;` 9, and a stung boX cap 10, extendinglongitudinally and centrally through which is a hollow piston rodllcarrying a piston 12 upon its inner' end, and a bifurcated couplinglink 13 upon its outer projecting end by agency whereof it may bereciprocated in any approved manner.

At one end of the structure beyond the throw of piston 12, the pumpcylinder and its lining 4 are broken by a vent 18 shown by dotted4lines'in Fig. 1, same being guarded by a screw plug 13b, for thepurposeof admitting air to the interior of the pump cylinder at suchtimes as it may be desired to drain it, a practice common to suchstructures. And, as will also be seen by reference to Fig. l, the backcylinder-head 8 is perforated centrally as at 14 and screwthreaded,being connected on the outside by an air tube 15 with the air chamber 2above, for purposes that will later appear, while from the inside ofthis head 8 is projected centrally an air compressing tube 16 fixed withrelation to the piston-rod 11 and extending longitudinally therethrougha distance approximately equal to the length of the cylinder 4. Upon theouter end of tube 16 is threaded a valve cage 17 shouldered as at 18 toafford a seat for the air valve 19 and equipped with a pin 2O crossingsaid cage transversely to serve. as a limit stop for this valve. VBeyondthe valve-seat 1S, cage 17 is reduced in diameter as atl 21 to receiveannular packing glands 22, 22, the latter being held in place by a screwthimble 23 threadedvupon the extremity of the cage member 17, wherebythe fixed compression tube 16 is securely packed with relation to itssurrounding reciprocating pump piston rod 11. v

As will be seen by inspection of en larged Fig. 2 the body of coupling13 is hollow to form an air compression chamber 24, and is secured at 25to the reciprocating` rod 11 in screw threaded relation. It isfurthermore counterbored vertically at- 26, threaded as at 27, andfitted with a vertically adjustable nipple 28, its inner end serving asa seat for thevertically movable check valve 29, and its outerl endflanged as at 30 to retain a suitable packing 31, while this air valve29 is grooved longitudinally as at 32 to serve as an air by-pass whenthe nipple 28l is unscrewed.

This being a description of my invention in its best form ofconstruction at present known to me, its operation may be brieflysetvforth as follows: Presuming the piston 12 to be at the end of itsstroke as shown by the drawings, and a charge of water to have beenforced thereby into the air chamber 2 in the usual and well knownmanner, withdrawal of coupling 13, either manually or mechanically, nowserves to withdraw piston rod 11, and, by agency of its piston 12, toforce the water upon its opposite side into the air chamber 2, as withdouble acting pumps generally. During this outward movement of hollowpiston rod 11, valve 19 isseated by back pressure from air chamber 2through air pipe 15 and tube 16, the air contained in chamber 24 beingrarefied as the outward movement progresses. As a consequence checkvalve 29 is lifted by atmospheric pressure, the said chamber 24 and theinterior of piston rod 11 being thus recharged with a fresh supply ofair. This accomplished, the reverse or inward thrust of coupling 13serves to compress the air now contained within chamber 24, unseat valve19, and deliver the charge Yinto the air chamber 2 via tube 16 and airpipe15, so that obviously there is a charge of air with each alternatecharge of water delivered to the air chamber 2 by each inthrust of thepiston, and thence by way of the outlet o1' discharge 6 to a suitableair tight tank not shown). If, however, it should be desired todiscontinue or cut out the pumping of air, this may readily beaccomplished by unscrewing nipple 2S until packing 31 ceases to performits intended function, whereupon the interior of compression chamber 24is opened to the atmosphere via groove 32 in one side of said screwnipple, so that within and without the chamber 24 will balance.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. A pump provided with a pumping cylinder, a piston and a hollow pistonrod, in combination with an air compressing tube within said hollow rodand fixed with relation thereto, a tubular connection between one end ofsaid air compressing tube and the pump discharge, a valve guarding theintake of said air compressing tube, a compression chamber carried bysaid rod, and a second valve guarding an inlet to said chamber,substantially as described. 2. A pump provided with a pumping cylmder, apiston, and a hollow piston rod, in combination with an air compressingtubc concentrically arranged within said rod and fixed with relationthereto, a tubular connection between one end of said air compressingtube and the pump discharge, a compression chamber carried by said rod,and suitable intake valves for said tube and chamber respectively,substantially as described.

3. A pump provided with a hollow piston-rod, in combination with an aircompressing tube located within said rod, a valve guarding the intake ofsaid tube, a compression chamber carried by said rod, a check valveguarding an inlet to said chamber, and an air by-pass around said checkvalve, substantially as described.

4. A horizontal double acting force pump having a hollow piston-rod incombination with an air compressing tube operatively connected at oneend with the pump discharge, a valve guarding the intake of said tube, acompression chamber carried by said rod, and a check-valve guarding aninlet to said chamber, substantially as described.

As an article of manufacture a valvecase, a ported nipple adjustablysecured in said case, and a by-pass in said nipple around said valveadapted to be opened or closed by the adjust-ment referred to,substantially as described.

6. A pump provided with a pumping cylinder, a piston and a hollow pistonrod, in combination with an air compressing tube within said hollow rodand fixed with relalSO tion thereto, a common discharge for said pumpand air compressing tube, a valve guarding the intake of said tube, acompression chamber carried by the projecting end of said rod, and aValve controlling the nlet to said chamber, substantially as described.

In testimony whereof I aiix my signature, 1n presence of tWo subscribingWitnesses.

JAMES M. STRATTON.

Witnesses:

M. L. HOLE, W. Gr. BUTLER.

